RIP. Darn tootin' there ain't nothing wrong with wanting to be with your own. We can all be different and embrace it and that's OK! We have lived (mostly) in peace despite it all this time, and will continue to do so with all our diverse cultures.
The drawback: only works on new lifeforms. Still, that could be a marvelous gift to our children; A methuselah-like lifespan would be a tremendous gift to give your child.
Paging Stef Molyneux! This explanation actually holds water; people continue childhood behaviors long after they are productive or useful to them. And neglect tends to produce unusual levels of tantrums and chimp-outs.
See, you didn't sign your boys up to be soldiers, so we're gonna give it to people totally dependent on us -- Always count on government to discriminate in favor of those guaranteed to vote for more government.